All three paste paths (hotkey, context menu, middle-click) were sending
raw clipboard text directly to the session backend via writeToSession(),
bypassing xterm's built-in term.paste() which handles bracketed paste
wrapping. When a remote application like vim enables bracketed paste
mode (CSI ?2004h), pasted text must be wrapped in \e[200~ / \e[201~
so the application can distinguish paste from typed input.
Without these markers, vim's autoindent treats each pasted newline as
a manual Enter keypress, causing indentation to accumulate
progressively with each line (the "staircase effect").
Now checks term.modes.bracketedPasteMode before sending and wraps
the text accordingly on all paste paths.
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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